Power-transmission device.



T. L. FAWICK.

POWER TRANSMISSION DEVICE.

APPLICATION FILED JAN. 25. 1915.

1,169,072, Patented Jan.18,`1916.

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THOMAS L. FAWICK, 0F SIOUX FALLS, SOUTHDAKOTA.

POWER-TRANSMISSION DEVICE.

5 county, South Dakota, have invented certain new and useful Improvements in Power- Transmission Devices, of which the following is a specication.

My invention relates to improvements in power transmission devices, and the object of my improvement is to supply for use on a f tractor, or the like, a compact mechanism of the kind mentioned which will be efficient -in use and adapted to be so inclosed as to keep out dust or other obstructing substances. This object I have accomplished by the mechanism which is;y hereinafter described and claimed, and which is illustrated inthe accompanying draw-ing, which is a horizontal medial-section of the gearing,"bearings, and casing of my transmission device, the shafts only not being sectioned.

The compact rectangular casing 21 is provided with anti-friction bearings of a wellbe ydescribed'. Of these,'the power shiaft 1, has within the casing a bevel-pinion 2 secured thereon and in mesh, on opposite sides, with like bevel-gear wheels 3 and 4, the gearwheel 3 being mounted onthe shaft 25, and the gear-wheel'4 upon a pulley-shaft 5, the pulley not being shown.

The numeral 22 denotes a partof theY shaft 25, locatedY between the bevel gearwheels 3 and 4, and having splines 10, a gear-wheel 6 being slidably non-rotatably mounted on said splines. The wheel 6 is of the spur-tooth type, and has an annular groove 8 medially cut through its teeth to provide spaced but alined pairs of teeth 7 and 9. Any suitable or well known shifting means, such as the bifurcations of a forked lever not shown, may be inserted in said groove, whereby the wheel 6 vmay be shifted to and fro along the shaft part 22 as desired, to enmesh the ends of the teeth 7 or 8, alternately with the internal-gear teeth 23 or 24 respectively provided on the said bevel-gears 4 and 3.

The numerals 19 and 20 denote alined shafts on whose outer ends may be mounted the traction-wheels of a tractor or like vehicle, but not here shown. A differential gearing connects the abutting ends of said shaft within said casing, comprising the bevel-gears 13"' and 14mouted on said Specification of Letters Patent.

known type for the various shafts about to4 Patented aan. 1s, 1916..

Application led January 25, 1915. Serial No. 4,819.

shafts, and bevel-pinions 17 and 18 mounted on stub-shafts within the hollow hub of a spur-gear wheel y 11, said bevel-gears and plnlons intermeshing with each other in the usual way, and the spur-gear wheel 11 intermeshing with the gear-wheel 6.

While the gears of the device are-in the positions shown, the wheel 6 is idle, as also the differential gear, but theI pulley-shaft 5 is rotated. When the wheel 6 is shifted toward the wheel 4 and the ends of its teeth 7 intermeshed with the internal-gear teeth 23 of the wheel 4, the latter rotates the wheels 6 and 11, and by means of the differ- `ential gearing, rotates the traction-wheel..

shafts 19 and 20 in one direction. When the wheel 6. is shifted sufliciently in anopposite direction over the splines 10, the outer ends of its teeth 9 are intermeshed with the internalgear teeth-24 of the bevel-gear 3, and, since the teeth of the wheel 11 are always in mesh `with the teeth of said wheel 6, the wheel 11, said differential gearing, and the shafts 19 and A20 are rotated in an opposite direction. y

The device occupies but little space, and its casing 21 covers the gearing thereof securely to prevent the intrusion` of foreign matters from without. Y

Having described my invention, what l claim as new, and desire to secure by Letters Patent, is: Y

12 A power transmission device, comprising a rotatable driving shaft, a bevel-pinion mounted thereon, bevel-gear wheels intermeshing with opposite sides o f said pinion, a driven-shaft onwhich one of said bevelgear wheels is mounted, a stub-shaft on which the other bevel-gear wheel is mounted and ext-ending therebeyond toward the said driven-shaft 1n alinement-therewith, a pinion slidably and non-rotatably mounted on and extending therebeyond toward the said driven-shaft in alinement therewith, a pinion slidably and non-.rotatably mounted on thex stub-shaft and having an annular groove intersecting its teeth medially'and circumferentially and adapted to receive movable` shifting-means, said bevel-gear wheels having like clutch-elements thereon, the lastmentioned pinion being movable along the 1,0 stub-shaft oppositely -to intermesh the outer ends of its teeth with the said clutch-elements alternately, and a gear-wheel interlneshed with the teeth of the last-mentioned pinion at all times.

Signed at lVatei-loo, Iowa, this 6th day ofY 15 GEO. C. KENNEDY.' 

